Index: kern_descrip.c
===================================================================
RCS file: /cvsroot/src/sys/kern/kern_descrip.c,v
retrieving revision 1.242
diff -u -u -r1.242 kern_descrip.c
--- kern_descrip.c	3 Jan 2019 10:16:43 -0000	1.242
+++ kern_descrip.c	20 Feb 2019 18:52:38 -0000
@@ -750,7 +750,7 @@
 	fdfile_t *ff;
 	fdtab_t *dt;
 
-	if (flags & ~(O_CLOEXEC|O_NONBLOCK))
+	if (flags & ~(O_CLOEXEC|O_NONBLOCK|O_NOSIGPIPE))
 		return EINVAL;
 	/*
 	 * Ensure there are enough slots in the descriptor table,
@@ -791,7 +791,7 @@
 	mutex_exit(&fdp->fd_lock);
 
 	dt->dt_ff[newfd]->ff_exclose = (flags & O_CLOEXEC) != 0;
-	fp->f_flag |= flags & FNONBLOCK;
+	fp->f_flag |= flags & (FNONBLOCK|FNOSIGPIPE);
 	/* Slot is now allocated.  Insert copy of the file. */
 	fd_affix(curproc, fp, newfd);
 	if (ff != NULL) {